package com.sky.annotation;

import com.sky.constant.AutoFillConstant;
import com.sky.context.BaseContext;
import com.sky.enumeration.OperationType;
import lombok.extern.slf4j.Slf4j;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.Signature;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.aspectj.lang.reflect.MethodSignature;
import org.springframework.stereotype.Component;

import java.lang.reflect.Method;
import java.time.LocalDateTime;

//切面类   通知加切入点
@Slf4j
@Aspect
@Component
public class AutoFillAspect {

    //切入点
    @Pointcut("execution(* com.sky.mapper.*.*(..)) && @annotation(com.sky.annotation.AutoFill)")
    public void autoFillPointCut(){}
 @Before("autoFillPointCut()")
    public void autoFill(JoinPoint joinPoint){
       log.info("开始进行公共字段自动填充");
     //获取数据库的操作类型
     MethodSignature signature = (MethodSignature) joinPoint.getSignature();//方法签名对象
     AutoFill autoFill = signature.getMethod().getAnnotation(AutoFill.class);//获得方法上注解对象
     OperationType operationType = autoFill.value();//获得数据库操作类型

     //被拦截的实体参数
     Object[] args = joinPoint.getArgs();
     if (args == null || args.length == 0){
         return;
     }
     Object entity = args[0];
     //准备赋值的数据
     LocalDateTime now = LocalDateTime.now();
     Long currentId = BaseContext.getCurrentId();
     //根据不同的操作类型  为对应的属性通过反射来赋值
       if (operationType == OperationType.INSERT){
            //4个公共字段值
           try {
               Method setCreateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_TIME, LocalDateTime.class);
               Method setCreateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_USER, Long.class);
               Method setUpdateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
               Method setUpdateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);

               //通过反射赋值
               setCreateTime.invoke(entity,now);
               setCreateUser.invoke(entity,currentId);
               setUpdateTime.invoke(entity,now);
               setUpdateUser.invoke(entity,currentId);
           } catch (Exception e) {
            e.printStackTrace();
           }


       } else if (operationType == OperationType.UPDATE) {
           try {
               Method setUpdateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
               Method setUpdateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);
               setUpdateTime.invoke(entity,now);
               setUpdateUser.invoke(entity,currentId);
           } catch (Exception e) {
               e.printStackTrace();
           }
       }


 }
}
